WF_ACTIVITIES table stores the definition of an activity. Activities can be processes, notifications, functions or folders. A process activity is a modelled workflow process, which can be included as an activity in other processes to represent a subâ€“process. A notification activity sends a message to a performer. A functions activity performs an automated function that is written as a PL/SQL stored procedure. A folder activity is not part of a process, it provides a means of grouping activities. WF_ITEMS is the runtime table for workflow processes. Each row defines one work item within the system. The WF_ITEM_ATTRIBUTES table stores definitions of attributes associated with a process. Each row includes the sequence in which the attribute is used as well as the format of the attribute data. WF_NOTIFICATIONS holds the runtime information about a specific instance of a sent message. A new row is created in the table each time a message is sent.